General This standard covers the dimensional and general specifications@ including performance requirements@ for carbon steel self-drilling tapping screws suitable for use in general applications. It is the objective of this standard to insure that carbon steel self-drilling tapping screws@ by meeting the mechanical and performance requirements specified@ shall drill a hole and from or cut mating threads in materials into which they are driven without deforming their own thread and without breaking during assembly. An Appendix is included to provide a recommended technique for measuring the case depth on the screws.